Improvement in methods of forming spur-lips of auger-bits



UNITEDjsTATE-S PATENT EEICEo *NWILLIAM A. IvEs, oF NEW HAVEN, CONNECTICUT.

IMPROVEMENT IN METHODS 'oF FoRMlNGsPuR-UPS 0F AueER-BITS.

Specification forming part of Letters Patent No. 112,255, dated February 28, 1871.

i of Connecticut, have invented a new Improvement in Process of Forming Spur-Lips of `Auger-Bits; andIdo hereby declare the following, when taken in connection with the accompanying drawing, and the letters of reference marked thereon, to be a full, clear, and

exact description of thesame, and `which said `drawing constitutes part of this specification,

and represents, in-

Figure 1,a side view of the bit complete, looking` towardthe edge of the spur-lip; Fig. 2, a side view of *the same turned one-fourth around; Fig. 3, a sidefview of the blank preparatory to forming a spur-lip; Fig. 4, an end i i view ofthe same;1Fig. 5, the blank after the `lips have been turned; Fig. 6, one-half of the die; Fig. 7 ,the follower; `and Figs. 8 and 9,

\ the process for forming the lips.

This invention relates to an improvement in the process of forming spur-lips to angers.

Heretofore this has been done by forging the lips thicker at the `cutting edge, and filing `down the edgeto leave the spur or lip projecting at rightiangles to the cutting-edge.

i Thismakes the cutting end of the auger more difficult to form than would beV if the same thickness were maintained throughout the twist to the end ofthe cutter.

To accomplishzthis is the object `of my in- "vention, which consists in spreading the last twist, which is to' form the cutters, so that, on

a line radial from the center, the edge is as much longer than the diameter of the bit as the height of the: spur to be formed then this extra length of `lip is, by. dies or with suitable devices, turned up at right angles to the cutinsuitable dies or other devices, the projecting portions of the lips a a are turned up to form blanks d d for the lips, as seen in Fig. 5, bringing the auger at the cutting-edge of the same diameter as other parts of the twist; then the spurs are ground and filed into shape, as seen in Figs. l and 2.

The best means known to me for thus forming the lips I illustrate in Figs. 6, 7, 8, and 9. In Fig. 6 one-half the die only is shown.

A is the die, in which is arranged a sliding crimp-form, D, which iits closely the twist of the bit, as seen in Fig. 8, and is arranged to slide longitudinally within the die. C, the follower, has'a longitudinal movement axially with the center of the die, and also a rotary movement.

rlhe blank, as formed, is laid into one part of the die, so that one of the lips a projects beyond the extreme edge of the part B. The other part of the die closed onto the bit will, in like manner, lie up under the other lip. In

Vthis position, which is as seen in Fig. 8, the

as from the position in Fig. 8 to that in Fig.

9, carrying with it the bit. To thus force the bit back, the follower C, revolving, is advanced to and pressed against the lip of the bit, forcing the bit into the die. The projecting ends are, by the force of the die, pressed up around the follower, which, revolving, shapes the spurlip, and at the same time forms the point j', which extends into a recess formed in the follower for that purpose.

A spring, a, is arranged back of the crimp B, to force it forward when the follower is withdrawn.

I claim as my invention- The process herein described for forming the spur-lips of auger-bits.

WM.y A. ivEs.

Witnesses:

JOHN H. SHUMWAY, A. J. TTBBITs. 

